EP3075995B1 - Injection control apparatus for diesel engine - Google Patents
Injection control apparatus for diesel engine Download PDFInfo
- Publication number
- EP3075995B1 EP3075995B1 EP16162269.1A EP16162269A EP3075995B1 EP 3075995 B1 EP3075995 B1 EP 3075995B1 EP 16162269 A EP16162269 A EP 16162269A EP 3075995 B1 EP3075995 B1 EP 3075995B1
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- Prior art keywords
- time
- control unit
- fuel
- period
- detects
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- 238000002347 injection Methods 0.000 title claims description 37
- 239000007924 injection Substances 0.000 title claims description 37
- 239000000446 fuel Substances 0.000 claims description 27
- 238000001514 detection method Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 239000002828 fuel tank Substances 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/401—Controlling injection timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/021—Engine temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0606—Fuel temperature
Definitions
- the present invention relates to an injection control apparatus for a diesel engine.
- a microprocessor unit (MPU) for exerting main control and a driver for driving hardware are provided within an engine control unit (ECU).
- a driver for driving an injector plays an important role in control of an engine, and is called an "injector driver”.
- An MPU is an injection control apparatus which calculates an injection timing and an injection time, and provides an instruction signal indicating a suitable injection timing and a suitable injection time to a so-called injector driver described above.
- a current is fed to an injector driver in two stages of a stage in which a current of a first hold is fed and a stage in which a current of a second hold is fed.
- a current of a first hold a large current is required in order to open a core valve.
- a current of a second hold may be a current smaller than the current of the first hold because the current of the second hold has only to maintain the opened core valve.
- An apparatus described in WO 2011/046074 A is known as an apparatus configured to achieve reasonable injection using the above-described two-stage injection in which a strong current is firstly fed and thereafter a weak current is fed.
- a time of a first hold of a driving current for the injector described above is generally set to a predetermined time having an optimum value.
- an MPU is arranged so as to control driving of the injector with a time of a first hold being set to an optimum value, an actual injection amount may probably vary by various factors such as a temperature condition.
- An object of the present invention is to provide an improved injection control apparatus for a diesel engine, which allows for a satisfactory engine starting while achieving a first hold for opening a valve and a second hold for maintaining a valve-opened state even if a change occurs in various conditions such as a temperature condition at the time of engine start.
- an injection control device as claimed in claim 1.
- a CRS diesel engine A of an overhead valve type includes a cylinder 1, a cylinder head 2, a head cover 3, an oil pan 4, a cooling fan 5, a piston 6, a crank shaft 7, a flywheel 8, a radiator 9, a dynamo 10, an oil pump 11, an exhaust manifold 12, and a rail 40 (common rail 40).
- a valve mechanism D of the diesel engine A includes a cam shaft 13 which is driven by the crank shaft 7 via a gear mechanism not shown, a cam 14 which is attached to the cam shaft 13 so that the cam 14 can rotate integrally with the cam shaft 13, a push rod 15 which is pushed and driven by the cam 14, a rocker arm 17 which is pivotally supported by an arm shaft 16 provided in the head cover 3 so as to be rockable, and an intake valve 19 including a valve body 19A which faces a combustion chamber 18.
- a reference symbol "20" denotes a fuel supply pump
- a reference symbol "21” denotes an injector (fuel injector)
- a reference symbol “23” denotes an intake manifold.
- the push rod 15 placed vertically has a lower end part at which a tappet 15A which is in sliding contact with the cam 14 is supported through spherical fitting so that the push rod 15 and the tappet 15A can move relatively to each other. Also, the push rod 15 has an upper end part at which a pushing end 15B is formed.
- the rocker arm 17 which is pivotally supported by the cylindrical arm shaft 16 has an end part on a base side thereof which is closer to the push rod, at which a shaft pin 24 together with a rock nut (not denoted by a reference symbol) is screwed. Also, the rocker arm 17 has a tip part, below which the intake valve 19 is provided.
- the diesel engine A includes an ECU 31 as a control unit, to which various state detection units s, a battery 37, a plurality of injectors (fuel injectors) 21, and the like are conductively connected.
- the various state detection units s include a water temperature gauge 33 for measuring a temperature of cooling water, a fuel pressure sensor 34 for measuring a common rail pressure, a fuel temperature detection sensor 35 for measuring a temperature of fuel, and a voltmeter 36 for measuring a voltage of the battery 37.
- the state detection units s may also include a thermometer 38 for measuring an outside air temperature and a hygrometer 39.
- the injector 21 provided in each of cylinders includes a solenoid valve 26 for injecting high-pressure fuel which is sent from the fuel supply pump 20 via the rail 40, and a solenoid (an example of an electromagnetic actuator) 25 which controls opening and closing of the solenoid valve 26.
- a solenoid valve 26 for injecting high-pressure fuel which is sent from the fuel supply pump 20 via the rail 40
- a solenoid an example of an electromagnetic actuator 25 which controls opening and closing of the solenoid valve 26.
- the diesel engine A is provided with an injection control apparatus H utilizing the ECU 31. That is, the diesel engine A includes the injector 21 for injecting fuel which is accumulated under pressure toward the combustion chamber 18 upon opening of the solenoid valve 26 in a closed position, an injector driver 27 for supplying a current to the solenoid 25 which controls an opening operation and a closing operation of the solenoid valve 26, and a plurality of state detection units s for detecting a state of an engine or a state of an ambient environment.
- the ECU 31 is provided with a valve opening control unit 28 which supplies, to the solenoid 25, a first current e1 for opening the solenoid valve 26 in a closed position, and an opened-state maintaining control unit 29 which supplies, to the solenoid 25, a second current e2 for maintaining the solenoid valve 26, which is opened by the valve opening control unit 28, continuously in an opened position.
- the ECU 31 further includes a timing control unit 30 for variably adjusting a period of time from a starting time of the valve opening control unit 28 to a time when the opened-state maintaining control unit 29 becomes active in place of the valve opening control unit 28, that is, a "first hold time t1", in accordance with a result of detection provided by each of the various types of state detection units s.
- the timing control unit 30 is a unit for variably setting a first hold time t1 during which the first current e1 is being fed, in accordance with a result of detection provided by the state detection unit s.
- a state in which the first current e1 is flowing is referred to as a "first hold”
- a state in which the second current e2 is flowing is referred to as a "second hold”.
- a current-flowing time of the first current e1 (time of a first hold) is referred to as a “first hold time t1”
- a current-flowing time of the second current e2 (time of a second hold) is referred to as a “second hold time t2”.
- a CPU 41 is configured by a circuit including the valve opening control unit 28, the opened-state maintaining control unit 29, and the timing control unit 30.
- the second current e2 may have a smaller value than the first current e1.
- a standard time (example of a standard time) of a first hold time t1 associated with the injector 21 is, for example, 500 ⁇ s.
- a first hold time t1 can be variably set, with the aim of controlling a lift amount of a core valve (a core valve of the solenoid valve 26) so as to be constant in a certain current-flowing time irrespective of a state of an ambient environment or a state of an injector, to thereby eliminate variation in an injection amount caused by the injector 21.
- a first hold time t1 is controlled to be longer than a standard time by the injection control apparatus H.
- FIG. 6 shows a relationship between a water temperature which is a temperature of cooling water and an extra time which is added to a first hold time t1.
- the extra time is 200 ⁇ s when the water temperature is -40°C
- the extra time is 50 ⁇ s when the water temperature is -20°C.
- the extra time is zero when the water temperature is in a range of 20°C to 100°C.
- the first hold time t1 is made shorter than the standard time by 50 ⁇ s.
- a reference symbol "a” denotes an injection instruction signal
- a reference symbol “b” denotes a first hold instruction signal
- a reference symbol “c” denotes an injector driving current for operating the injector driver 27.
- the CPU 41 may output a signal which indicates a time for a first hold time t1 to the injector driver 27 from a port which is different from a port of instruction for injection from the injector 21. Also, the CPU 41 may cause a single port to support all of cylinders and all of the injectors 21. Further, there is another possible way of control in which an instruction signal is toggled when an instruction for completion of a first hold is given and an instruction is given to the injector driver 27 when both edges are detected.
- Control is also exerted by the injection control apparatus H are as described in the following 1 to 3.
- a first hold time t1 is made shorter than a standard time.
- the first hold time t1 is controlled to be shorter than the standard time.
- An example of such a case is when the water temperature is 110°C in FIG. 6 .
- the CPU 41 senses a common rail pressure, a water temperature of cooling water for an engine, a temperature of fuel, a voltage of a battery, and the like, and calculates a time of a first hold based on data (values) obtained by sensing. Then, in accordance with a result of the calculation, an instruction is given from the CPU 41 to the injector driver 27.
- an instruction is given by using at least one line for one cylinder between 0 V (Low) and 5 V (High). For a four-cylinder engine, at least four lines are necessary. Then, as possible ways to variably set a first hold time t1, the following 4 and 5 can be conceived.
- Performance of the injector driver 27 is enhanced, so that a variable time of a first hold time t1 is incorporated in logic.
- At least one line from the CPU 41 to the injector driver 27 is additionally included for each cylinder, and a "High" signal is sent during a time of a first hold.
- the injection control apparatus H according to the present invention is configured such that an instruction is given with a Low/High signal along one line irrespective of how many cylinders are included or whether or not multi-stage injection is performed. Therefore, it is possible to variably set a first hold time t1 with the injector driver 27 having a simple structure, which results in reduction in a cost.
- the injection control apparatus H according to the present invention which uses only one line, is more preferable than an apparatus using many lines also in terms of noise resistance.
- the injection control apparatus H may variably adjust a ratio of a first hold time t1 to a sum of a first hold time t1 and a second hold time t2 in accordance with a result of detection provided by the state detection unit s.
- an injection control apparatus for a diesel engine including a timing control unit 30 for variably adjusting a ratio (t1/t1 + t2) of a time required for the valve opening control unit 28 (i.e., a first hold time t1) to a sum (t1 + t2) of either a period of time from a starting time of the valve opening control unit 28 to a time when the opened-state maintaining control unit 29 becomes active in place of the valve opening control unit 28, or a time required for the valve opening control unit 28 (i.e., a first hold time t1), and a time required for the opened-state maintaining control unit 29 (i.e., a second hold time t2), in accordance with a result of detection provided by the state detection units.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
- The present invention relates to an injection control apparatus for a diesel engine.
- In a common rail system (CRS) diesel engine for general purpose use including an industrial use, an agricultural use, and the like, a microprocessor unit (MPU) for exerting main control and a driver for driving hardware are provided within an engine control unit (ECU). A driver for driving an injector plays an important role in control of an engine, and is called an "injector driver". An MPU is an injection control apparatus which calculates an injection timing and an injection time, and provides an instruction signal indicating a suitable injection timing and a suitable injection time to a so-called injector driver described above.
- Generally, a current is fed to an injector driver in two stages of a stage in which a current of a first hold is fed and a stage in which a current of a second hold is fed. For a current of a first hold, a large current is required in order to open a core valve. On the other hand, a current of a second hold may be a current smaller than the current of the first hold because the current of the second hold has only to maintain the opened core valve. An apparatus described in
WO 2011/046074 A is known as an apparatus configured to achieve reasonable injection using the above-described two-stage injection in which a strong current is firstly fed and thereafter a weak current is fed. - Conventionally, in an injection control apparatus, a time of a first hold of a driving current for the injector described above is generally set to a predetermined time having an optimum value. However, even though an MPU is arranged so as to control driving of the injector with a time of a first hold being set to an optimum value, an actual injection amount may probably vary by various factors such as a temperature condition.
- Therefore, it is impossible to follow a change in an environmental condition or the like by only providing an apparatus which sets a time of a first hold to an optimum value in design phase. This may result in an increase or a decrease of an actual amount of injection from the injector with respect to an indicated amount of injection, and thus, such an apparatus still has room for improvement as the injection control apparatus.
- Prior art arrangements are known from
EP 1193384 ,WO 99/32776 EP 0893594 ,EP 1072779 ,US 6532940 andWO 02/06657 - An object of the present invention is to provide an improved injection control apparatus for a diesel engine, which allows for a satisfactory engine starting while achieving a first hold for opening a valve and a second hold for maintaining a valve-opened state even if a change occurs in various conditions such as a temperature condition at the time of engine start.
- According to the invention there is provided an injection control device as claimed in
claim 1. -
-
FIG. 1 is a front view of a common rail system (CRS) diesel engine; -
FIG. 2 is a side view of the diesel engine shown inFIG. 1 , in which some part is omitted; -
FIG. 3 is a front view of a section of the diesel engine shown inFIG. 1 ; -
FIG. 4 is a block diagram showing an injection control apparatus for a diesel engine; -
FIG. 5 is an explanatory diagram showing waveforms of an injector driving current and the like; and -
FIG. 6 is a chart showing a relationship between a water temperature and an extra time of a first hold in an injection control apparatus. - Hereinafter, a preferred embodiment of an injection control apparatus for a diesel engine according to the present invention will be described with reference to accompanying drawings, taking as an example a case where a diesel engine is a common rail system (CRS) diesel engine for an agricultural use which is employed in a tractor or the like.
- As shown in
FIGS. 1 and2 , a CRS diesel engine A of an overhead valve type (OHV type) includes acylinder 1, acylinder head 2, ahead cover 3, anoil pan 4, acooling fan 5, apiston 6, acrank shaft 7, aflywheel 8, aradiator 9, adynamo 10, anoil pump 11, anexhaust manifold 12, and a rail 40 (common rail 40). - As shown in
FIG. 3 , a valve mechanism D of the diesel engine A includes acam shaft 13 which is driven by thecrank shaft 7 via a gear mechanism not shown, acam 14 which is attached to thecam shaft 13 so that thecam 14 can rotate integrally with thecam shaft 13, apush rod 15 which is pushed and driven by thecam 14, arocker arm 17 which is pivotally supported by anarm shaft 16 provided in thehead cover 3 so as to be rockable, and anintake valve 19 including avalve body 19A which faces acombustion chamber 18. - Further, in
FIG. 3 , a reference symbol "20"denotes a fuel supply pump, a reference symbol "21" denotes an injector (fuel injector), and a reference symbol "23" denotes an intake manifold. - As shown in
FIG. 3 , thepush rod 15 placed vertically has a lower end part at which atappet 15A which is in sliding contact with thecam 14 is supported through spherical fitting so that thepush rod 15 and thetappet 15A can move relatively to each other. Also, thepush rod 15 has an upper end part at which a pushingend 15B is formed. - The
rocker arm 17 which is pivotally supported by thecylindrical arm shaft 16 has an end part on a base side thereof which is closer to the push rod, at which ashaft pin 24 together with a rock nut (not denoted by a reference symbol) is screwed. Also, therocker arm 17 has a tip part, below which theintake valve 19 is provided. - Next, an injection control apparatus for controlling injection of fuel in the above-described diesel engine will be described.
- As shown in
FIG. 4 , the diesel engine A includes anECU 31 as a control unit, to which various state detection units s, abattery 37, a plurality of injectors (fuel injectors) 21, and the like are conductively connected. - The various state detection units s include a
water temperature gauge 33 for measuring a temperature of cooling water, afuel pressure sensor 34 for measuring a common rail pressure, a fueltemperature detection sensor 35 for measuring a temperature of fuel, and avoltmeter 36 for measuring a voltage of thebattery 37. The state detection units s may also include athermometer 38 for measuring an outside air temperature and ahygrometer 39. - The
injector 21 provided in each of cylinders includes asolenoid valve 26 for injecting high-pressure fuel which is sent from thefuel supply pump 20 via therail 40, and a solenoid (an example of an electromagnetic actuator) 25 which controls opening and closing of thesolenoid valve 26. As a result of a valve opening operation in which thesolenoid valve 26 being urged to be closed is shifted to an opened position through energization of thesolenoid 25, theinjector 21 is allowed to inject high-pressure fuel toward thecombustion chamber 18. - The diesel engine A is provided with an injection control apparatus H utilizing the
ECU 31. That is, the diesel engine A includes theinjector 21 for injecting fuel which is accumulated under pressure toward thecombustion chamber 18 upon opening of thesolenoid valve 26 in a closed position, aninjector driver 27 for supplying a current to thesolenoid 25 which controls an opening operation and a closing operation of thesolenoid valve 26, and a plurality of state detection units s for detecting a state of an engine or a state of an ambient environment. - Further, the
ECU 31 is provided with a valveopening control unit 28 which supplies, to thesolenoid 25, a first current e1 for opening thesolenoid valve 26 in a closed position, and an opened-state maintainingcontrol unit 29 which supplies, to thesolenoid 25, a second current e2 for maintaining thesolenoid valve 26, which is opened by the valveopening control unit 28, continuously in an opened position. TheECU 31 further includes atiming control unit 30 for variably adjusting a period of time from a starting time of the valveopening control unit 28 to a time when the opened-state maintainingcontrol unit 29 becomes active in place of the valveopening control unit 28, that is, a "first hold time t1", in accordance with a result of detection provided by each of the various types of state detection units s. - As shown in
FIG. 5 , thetiming control unit 30 is a unit for variably setting a first hold time t1 during which the first current e1 is being fed, in accordance with a result of detection provided by the state detection unit s. - Herein, a state in which the first current e1 is flowing is referred to as a "first hold", and a state in which the second current e2 is flowing is referred to as a "second hold". A current-flowing time of the first current e1 (time of a first hold) is referred to as a "first hold time t1", and a current-flowing time of the second current e2 (time of a second hold) is referred to as a "second hold time t2". Further, a
CPU 41 is configured by a circuit including the valveopening control unit 28, the opened-state maintainingcontrol unit 29, and thetiming control unit 30. The second current e2 may have a smaller value than the first current e1. - A standard time (example of a standard time) of a first hold time t1 associated with the
injector 21 is, for example, 500 µs. - It is designed such that a first hold time t1 can be variably set, with the aim of controlling a lift amount of a core valve (a core valve of the solenoid valve 26) so as to be constant in a certain current-flowing time irrespective of a state of an ambient environment or a state of an injector, to thereby eliminate variation in an injection amount caused by the
injector 21. - Therefore, in an environment where the
injector 21 is provided, in a case where it is determined that a core valve has greater difficulty in moving as compared to a core valve in a reference state, a first hold time t1 is controlled to be longer than a standard time by the injection control apparatus H. - Description will be made on a case where a first hold time t1 is made longer than a standard time in the injection control apparatus H.
FIG. 6 shows a relationship between a water temperature which is a temperature of cooling water and an extra time which is added to a first hold time t1. As can be seen fromFIG. 6 , the extra time is 200 µs when the water temperature is -40°C, and the extra time is 50 µs when the water temperature is -20°C. Further, the extra time is zero when the water temperature is in a range of 20°C to 100°C. Meanwhile, when the water temperature is 110°C, the first hold time t1 is made shorter than the standard time by 50 µs. - In
FIG. 5 , a reference symbol "a" denotes an injection instruction signal, a reference symbol "b" denotes a first hold instruction signal, and a reference symbol "c" denotes an injector driving current for operating theinjector driver 27. In the injection control apparatus H, an instruction is given in the following ways. TheCPU 41 may output a signal which indicates a time for a first hold time t1 to theinjector driver 27 from a port which is different from a port of instruction for injection from theinjector 21. Also, theCPU 41 may cause a single port to support all of cylinders and all of theinjectors 21. Further, there is another possible way of control in which an instruction signal is toggled when an instruction for completion of a first hold is given and an instruction is given to theinjector driver 27 when both edges are detected. - Control is also exerted by the injection control apparatus H are as described in the following 1 to 3.
- 1. A first hold time t1 (a current-flowing time of the first current e1) is made longer when the
fuel pressure sensor 34 detects a low common rail pressure, and a first hold time t1 is made shorter when thefuel pressure sensor 34 detects a high common rail pressure. - 2. A time of a first hold is made longer when the fuel
temperature detection sensor 35 detects a low temperature of fuel in a fuel tank, and a time of a first hold is made shorter when the fueltemperature detection sensor 35 detects a high temperature of fuel in a fuel tank. - 3. A time of a first hold is made longer when the
voltmeter 36 detects a low voltage of thebattery 37, and a time of a first hold is made shorter when thevoltmeter 36 detects a high voltage of thebattery 37. - Next, description will be made on a case where a first hold time t1 is made shorter than a standard time. Similarly to the above case where the first hold time t1 is made longer than the standard time, in an environment where the
injector 21 is provided, when it is possible to determine that a core valve can move more easily than a core valve in a reference state, the first hold time t1 is controlled to be shorter than the standard time. An example of such a case is when the water temperature is 110°C inFIG. 6 . - The
CPU 41 senses a common rail pressure, a water temperature of cooling water for an engine, a temperature of fuel, a voltage of a battery, and the like, and calculates a time of a first hold based on data (values) obtained by sensing. Then, in accordance with a result of the calculation, an instruction is given from theCPU 41 to theinjector driver 27. Generally, in giving an instruction for injection from theCPU 41 to theinjector driver 27, an instruction is given by using at least one line for one cylinder between 0 V (Low) and 5 V (High). For a four-cylinder engine, at least four lines are necessary. Then, as possible ways to variably set a first hold time t1, the following 4 and 5 can be conceived. - 4. Performance of the
injector driver 27 is enhanced, so that a variable time of a first hold time t1 is incorporated in logic. - 5. At least one line from the
CPU 41 to theinjector driver 27 is additionally included for each cylinder, and a "High" signal is sent during a time of a first hold. - The injection control apparatus H according to the present invention is configured such that an instruction is given with a Low/High signal along one line irrespective of how many cylinders are included or whether or not multi-stage injection is performed. Therefore, it is possible to variably set a first hold time t1 with the
injector driver 27 having a simple structure, which results in reduction in a cost. The injection control apparatus H according to the present invention, which uses only one line, is more preferable than an apparatus using many lines also in terms of noise resistance. - The injection control apparatus H may variably adjust a ratio of a first hold time t1 to a sum of a first hold time t1 and a second hold time t2 in accordance with a result of detection provided by the state detection unit s. In such a case, provided is an injection control apparatus for a diesel engine including a
timing control unit 30 for variably adjusting a ratio (t1/t1 + t2) of a time required for the valve opening control unit 28 (i.e., a first hold time t1) to a sum (t1 + t2) of either a period of time from a starting time of the valveopening control unit 28 to a time when the opened-state maintainingcontrol unit 29 becomes active in place of the valveopening control unit 28, or a time required for the valve opening control unit 28 (i.e., a first hold time t1), and a time required for the opened-state maintaining control unit 29 (i.e., a second hold time t2), in accordance with a result of detection provided by the state detection units.
Claims (2)
- An injection control apparatus for a diesel engine, comprising:an injector (21) for injecting fuel which is accumulated under pressure toward a combustion chamber upon opening of a solenoid valve (26);an injector driver (27) for supplying a current to an electromagnetic actuator (25) which controls an opening operation and a closing operation of the solenoid valve (26);a plurality of state detection units (s) for detecting a state of an engine or a state of an ambient environment;a valve opening control unit (28) for supplying, to the electromagnetic actuator (25), a first current (e1) for opening the solenoid valve (26);an opened-state maintaining control unit (29) for supplying, to the electromagnetic actuator (25), a second current (e2) for maintaining the solenoid valve (26), which is opened by the valve opening control unit (28), continuously in an opened position; anda timing control unit (30) for variably adjusting a period of time (t1) from a starting time of the valve opening control unit (28) to a time when the opened-state maintaining control unit (29) becomes active in place of the valve opening control unit (28), in accordance with a result of detection provided by the state detection units (s), wherein the plurality of state detection units (s) comprise a water temperature gauge (33), a fuel pressure sensor (34) for measuring common rail pressure, a fuel temperature detection sensor (35), and a voltmeter (36) for measuring a voltage of a battery (37), and each of these are used to detect the state of the engine or of the ambient environment,wherein there is a standard time of the period of time (t1) from a starting time of the valve opening control unit (28) to a time when the opened-state maintaining control unit (29) becomes active in place of the valve opening control unit (28), and wherein;said period of time (t1) is made longer than the standard time when the water temperature gauge (33) detects a low water temperature, and said period of time (t1) is made shorter than the standard time when the water temperature gauge (33) detects a high water temperature;said period of time (t1) is made longer than the standard time when the fuel pressure sensor (34) detects a low common rail pressure, and said period of time (t1) is made shorter than the standard timewhen the fuel pressure sensor (34) detects a high common rail pressure;said period of time (t1) is made longer than the standard time when the fuel temperature detection sensor (35) detects a low temperature of fuel in a fuel tank, and said period of time (t1) is made shorter than the standard time when the fuel temperature detection sensor (35) detects a high temperature of fuel in a fuel tank, and;said period of time (t1) is made longer than the standard time when the voltmeter (36) detects a low voltage of the battery (37), and said period of time (t1) is made shorter than the standard time when the voltmeter (36) detects a high voltage of the battery (37).
- The injection control apparatus for a diesel engine according to claim 1, wherein
an engine control unit (ECU) includes the valve opening control unit (28), the opened-state maintaining control unit (29), and the timing control unit (30).
Applications Claiming Priority (1)
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JP2015072622A JP6393649B2 (en) | 2015-03-31 | 2015-03-31 | Diesel engine injection control device |
Publications (2)
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EP3075995A1 EP3075995A1 (en) | 2016-10-05 |
EP3075995B1 true EP3075995B1 (en) | 2021-12-29 |
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EP16162269.1A Active EP3075995B1 (en) | 2015-03-31 | 2016-03-24 | Injection control apparatus for diesel engine |
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US (1) | US10539091B2 (en) |
EP (1) | EP3075995B1 (en) |
JP (1) | JP6393649B2 (en) |
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CN114087078B (en) * | 2022-01-17 | 2022-04-08 | 南京工业大学 | Fuel oil thermal management method of aviation piston self-pressurization direct injection heavy oil engine |
Citations (1)
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EP2258937A1 (en) * | 2009-06-02 | 2010-12-08 | Delphi Technologies, Inc. | Method for optimizing flow performance of a direct injection fuel injector |
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JP3707210B2 (en) * | 1997-07-22 | 2005-10-19 | いすゞ自動車株式会社 | Fuel injection control device |
US6014956A (en) * | 1997-12-22 | 2000-01-18 | Caterpillar Inc. | Electronic control for a hydraulically activated, electronically controlled injector fuel system and method for operating same |
JP3932474B2 (en) * | 1999-07-28 | 2007-06-20 | 株式会社日立製作所 | Electromagnetic fuel injection device and internal combustion engine |
JP2001317394A (en) * | 2000-04-28 | 2001-11-16 | Mitsubishi Electric Corp | Fuel injection controller for cylinder injection engine |
US6467452B1 (en) * | 2000-07-13 | 2002-10-22 | Caterpillar Inc | Method and apparatus for delivering multiple fuel injections to the cylinder of an internal combustion engine |
IT1320679B1 (en) * | 2000-09-29 | 2003-12-10 | Fiat Ricerche | CONTROL DEVICE OF A COMMAND ELECTROMAGNET OF A DOSING VALVE OF A FUEL INJECTOR FOR A ENGINE |
JP4272897B2 (en) | 2002-01-30 | 2009-06-03 | パナソニック株式会社 | Encoding apparatus, decoding apparatus and method thereof |
JP3972685B2 (en) * | 2002-03-06 | 2007-09-05 | 株式会社デンソー | Accumulated fuel injection system |
JP4078874B2 (en) * | 2002-04-30 | 2008-04-23 | 三菱ふそうトラック・バス株式会社 | Booster fuel injection system |
US6848414B2 (en) * | 2002-08-08 | 2005-02-01 | Detroit Diesel Corporation | Injection control for a common rail fuel system |
JPWO2004053317A1 (en) * | 2002-12-10 | 2006-04-13 | 株式会社ミクニ | Fuel injection control method and fuel injection control device |
JP4251201B2 (en) * | 2006-07-20 | 2009-04-08 | トヨタ自動車株式会社 | Injector drive device |
WO2011046074A1 (en) | 2009-10-13 | 2011-04-21 | ボッシュ株式会社 | Pressure sensor diagnostic method and common rail fuel injection control device |
-
2015
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EP2258937A1 (en) * | 2009-06-02 | 2010-12-08 | Delphi Technologies, Inc. | Method for optimizing flow performance of a direct injection fuel injector |
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US10539091B2 (en) | 2020-01-21 |
JP2016191370A (en) | 2016-11-10 |
JP6393649B2 (en) | 2018-09-19 |
US20160290275A1 (en) | 2016-10-06 |
EP3075995A1 (en) | 2016-10-05 |
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